|Number of people admitted to hospital for multiple sclerosis by age group, percentage female, and the matching ratio which gives the number of people in the reference cohort† in each age group per person with multiple sclerosis in the same age group‡|
|Age group (years)||Number of people||Female (%)||Matching ratio|
† Conditions used in the reference cohort, with Office of Population, Censuses and Surveys (OPCS) code edition 4 for operations and ICD-10 code for diagnosis: appendectomy (OPCS4 H01-H03); bunion (M20.1); cataract (H25); deflected nasal septum and nasal polyp (J33, J34.2); dilation and curettage (OPCS Q10-Q11); haemorrhoids (I84); impacted tooth and other disorders of teeth (K00-K03); in-growing toenail and other diseases of nail (L60); inguinal hernia (K40); internal derangement of knee (M23); otitis externa and otitis media (H60-H67); sebaceous cyst (L72.1); squint (H49-H51); tonsillectomy and adenoidectomy (OPCS4 E20, F34, F36); upper respiratory tract infections (J00-J06); varicose veins (I83); vasectomy, female sterilisation and other contraceptive management (Z30).
‡ For example, in the age group 15–24, there are 992362 control people (511 controls for each of the 1942 people with MS in that age group). In the age group 45–54 there are 806328 controls (36 controls for each of the 22398 people with MS in that age group).
Ramagopalan et al.
Ramagopalan et al. BMC Neurology 2012 12:135 doi:10.1186/1471-2377-12-135